How to Use a US Postal API
- Irhaz Nizol
- Sep 29, 2022
- 1 min read
The postal API is a web service that provides addresses in JSON format. It allows you to search for a given address, using a PIN code or the Post Office Branch name. You can retrieve the address' details via a JSON response, which includes a status and message field. The "postoffice" field contains the postal address' data. There is no limit on the number of requests you can make, and the API is free for commercial use.

If you're looking to use a postal API in your application, you should first understand how it works. In order to use it, you'll need a Web application that supports HTTP requests. USPS APIs don't use standard authentication, but they do provide an attribute called USERID that identifies a developer. This USERID acts as the API key.
You can also use a Postal API to send outgoing emails. This requires you to have an API key that identifies your domain. You'll need to add this in your settings file before any emails can be sent. In addition, you'll need an SSL certificate for your domain. Once you've done this, you can access the Postal web interface and login using the user you created in the previous steps.
Another great use for a postal API is the ability to send direct mail, event-triggered. This way, you can schedule delivery and get notification when a document is opened. PostGrid also offers tracking features and can make sure your shipments are delivered on time. There are also APIs that can help you print postcards, which can be sent through the USPS.
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